All Calculators

BMI Calculator

Calculate your Body Mass Index using the WHO standard formula. Get your weight category and healthy weight range instantly.

Ideal Weight Calculator

Find your healthy weight range based on height, age, and gender using multiple validated formulas.

Body Fat Calculator

Estimate your body fat percentage using the US Navy method or BMI-based method.

BMI Prime Calculator

Calculate your BMI Prime — a ratio of your BMI to the upper ideal BMI of 25.

Navy Body Fat Calculator

Calculate body fat percentage using the official US Navy circumference measurement method.

Waist to Hip Ratio Calculator

Calculate your waist-to-hip ratio to assess cardiovascular and metabolic health risk.

Body Shape Calculator

Determine your body shape (apple, pear, hourglass, rectangle) from measurements.

Body Surface Area Calculator

Calculate body surface area (BSA) using the DuBois, Mosteller, and Haycock formulas.

Blood Pressure Calculator

Interpret your blood pressure reading and understand your cardiovascular health status.

Cholesterol Calculator

Interpret your cholesterol levels and understand your cardiovascular risk.

Vitamin D Calculator

Estimate your vitamin D requirements based on sun exposure, skin tone, and location.

Body Measurements Calculator

Calculate and track key body measurements including lean mass, body fat, and shape ratios.

Waist-to-Height Ratio Calculator

Calculate your waist-to-height ratio — a powerful predictor of cardiovascular and metabolic disease risk that outperforms BMI for detecting central obesity.

Healthy Weight Calculator

Find your healthy weight range using 5 validated methods — BMI range, Hamwi, Devine, Robinson, and Miller formulas — with frame size adjustments.

BMI Calculator for Children & Teens

Calculate BMI for children and teenagers aged 2–20 using CDC age-and-sex-specific percentile charts. Children's BMI is interpreted differently from adult BMI.

Metabolic Age Calculator

Calculate your metabolic age — how your BMR compares to the average for your age group. A lower metabolic age indicates a healthier, more efficient metabolism.

Biological Age Calculator

Find out how old your body really is. Estimate your biological age from 12 lifestyle factors including exercise, sleep, stress, diet, and heart rate.

Calorie Calculator

Calculate your BMR and TDEE using the Mifflin-St Jeor equation. Get personalized daily calorie targets for any goal.

TDEE Calculator

Calculate your Total Daily Energy Expenditure. The most important number for setting any nutrition goal.

Macro Calculator

Calculate your optimal protein, carbohydrate, and fat targets based on your calorie goal and fitness objective.

Calorie Deficit Calculator

Calculate your daily calorie deficit to lose weight at a safe, sustainable rate without sacrificing muscle.

Protein Intake Calculator

Calculate your optimal daily protein intake based on body weight, goal, and activity level.

Water Intake Calculator

Calculate your optimal daily water intake based on body weight, climate, and activity level.

BMR Calculator

Calculate your Basal Metabolic Rate — the calories your body burns at complete rest.

Intermittent Fasting Calculator

Calculate your eating and fasting windows for different intermittent fasting protocols.

Alcohol Calorie Calculator

Calculate calories from alcoholic drinks and understand their impact on your daily calorie budget.

Creatine Calculator

Calculate your optimal creatine dosage for loading and maintenance phases.

Fibre Intake Calculator

Calculate your recommended daily fibre intake based on age, sex, and calorie needs.

Keto Macro Calculator

Calculate ketogenic diet macros: high fat, moderate protein, very low carb targets.

Calorie Cycling Calculator

Plan your calorie cycling schedule with high and low calorie days to boost results.

Calorie Goal by Date Calculator

Calculate the daily calorie intake needed to reach your target weight by a specific date.

Weight Loss Calculator

Calculate how long it will take to reach your goal weight, your required daily calorie deficit, and your projected weekly fat loss rate.

Daily Calorie Calculator

Find out exactly how many calories you need per day to lose weight, maintain, or build muscle — personalised to your stats and activity level.

Macro Ratio Calculator

Find the optimal macronutrient ratios for your goal — fat loss, muscle gain, keto, endurance, or maintenance — with daily gram targets.

TDEE Calculator for Women

Calculate your Total Daily Energy Expenditure as a woman — with female-specific metabolic differences, activity levels, and goal-based calorie targets.

Weight Maintenance Calories Calculator

Calculate exactly how many calories you need to maintain your current weight — your TDEE maintenance calories — to stay weight-stable.

Protein Calculator

Calculate your optimal daily protein intake in grams based on body weight, goal, and activity — with per-meal targets and food source examples.

Calorie Intake Calculator

Calculate your recommended daily calorie intake to reach your goal weight by your target date — with a week-by-week timeline and safety analysis.

Net Carbs Calculator

Calculate net carbs by subtracting fibre and sugar alcohols from total carbohydrates. Essential for keto and low-carb diets.

GLP-1 Nutrition Calculator

Adjusted protein, calorie, and micronutrient targets for Ozempic, Wegovy, Mounjaro and Zepbound users. Prevent muscle loss on GLP-1 medications.

Harris-Benedict Calculator

Calculate BMR using the original 1919 Harris-Benedict equation and the revised 1984 Roza-Shizgal formula. Compare with Mifflin-St Jeor.

Heart Rate Zone Calculator

Calculate your 5 heart rate training zones based on your maximum heart rate.

One Rep Max Calculator

Calculate your one rep maximum (1RM) for any lift using multiple validated formulas.

Calories Burned Calculator

Calculate calories burned during exercise based on activity, duration, and body weight.

VO2 Max Calculator

Estimate your VO2 max — the gold standard of cardiovascular fitness — from running pace.

Running Calorie Calculator

Calculate calories burned running based on distance, speed, and body weight.

Running Pace Calculator

Calculate running pace, time, or distance. Essential for training and race planning.

Steps to Calories Calculator

Convert your daily step count to calories burned based on height, weight, and stride.

Muscle Gain Calculator

Calculate your optimal calorie surplus for lean muscle gain, your natural muscle-building potential, and required protein intake.

Fat-Burning Heart Rate Calculator

Calculate your personalised fat-burning heart rate zone (60–70% max HR) and all 5 training zones to optimise cardio for fat loss or performance.

Target Heart Rate Calculator

Calculate your target heart rate zones for every fitness goal — fat burning, aerobic fitness, anaerobic threshold, and maximum effort.

Calories Burned Exercise Calculator

Calculate calories burned during 40+ exercises including running, cycling, swimming, HIIT, strength training, yoga, and walking — personalised by weight.

FFMI Calculator

Calculate your Fat-Free Mass Index — how much muscle you have relative to height. Discover where you sit vs the natural muscle ceiling documented in research.

Zone 2 Heart Rate Calculator

Find your Zone 2 heart rate using the Maffetone Method — the aerobic training zone for fat burning, mitochondrial health, and longevity.

Sleep Cycle Calculator

Calculate optimal sleep and wake times based on 90-minute sleep cycle science.

Age Calculator

Calculate exact age in years, months, days, and more from a birth date.

Caffeine Calculator

Calculate safe daily caffeine limits and estimate how long caffeine stays in your system.

Pregnancy Due Date Calculator

Calculate your estimated due date from your last menstrual period or conception date.

Pregnancy Weight Gain Calculator

Calculate recommended pregnancy weight gain based on pre-pregnancy BMI using IOM guidelines.

Sleep Calculator

Calculate the best times to fall asleep or wake up based on 90-minute sleep cycles. Wake at the right point to feel dramatically more refreshed.

Kg to Lbs Converter

Convert kilograms to pounds instantly. Simple, accurate kg to lbs conversion.

Lbs to Kg Converter

Convert pounds to kilograms instantly. Accurate lbs to kg conversion.

Kg to Stone Converter

Convert kilograms to stone and pounds. Popular with UK users.

Cm to Feet Converter

Convert centimetres to feet and inches instantly. Essential for height conversions.